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Diffstat (limited to 'login/utmpname.c')
-rw-r--r--login/utmpname.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/login/utmpname.c b/login/utmpname.c
new file mode 100644
index 0000000000..81e857a2bc
--- /dev/null
+++ b/login/utmpname.c
@@ -0,0 +1,86 @@
+/* Copyright (C) 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#if _LIBC
+#include <libc-lock.h>
+#else
+#define __libc_lock_lock(NAME) ((void) 0)
+#define __libc_lock_unlock(NAME) ((void) 0)
+#define __libc_lock_define(CLASS,NAME)
+#define weak_alias(name, aliasname) \
+ extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
+#endif
+#include <stdlib.h>
+#include <string.h>
+#include <utmp.h>
+
+#include "utmp-private.h"
+
+
+/* This is the default name. */
+static const char default_file_name[] = _PATH_UTMP;
+
+/* Current file name. */
+const char *__libc_utmp_file_name = (const char *) default_file_name;
+
+/* We have to use the lock in getutent_r.c. */
+__libc_lock_define (extern, __libc_utmp_lock)
+
+
+int
+__utmpname (const char *file)
+{
+ int result = -1;
+
+ __libc_lock_lock (__libc_utmp_lock);
+
+ /* Close the old file. */
+ (*__libc_utmp_jump_table->endutent) ();
+
+ if (strcmp (file, __libc_utmp_file_name) != 0)
+ {
+ if (strcmp (file, default_file_name) == 0)
+ {
+ if (__libc_utmp_file_name != default_file_name)
+ free ((char *) __libc_utmp_file_name);
+
+ __libc_utmp_file_name = default_file_name;
+ }
+ else
+ {
+ char *file_name = __strdup (file);
+ if (file_name == NULL)
+ /* Out of memory. */
+ goto done;
+
+ if (__libc_utmp_file_name != default_file_name)
+ free ((char *) __libc_utmp_file_name);
+
+ __libc_utmp_file_name = file_name;
+ }
+ }
+
+ __libc_utmp_jump_table = &__libc_utmp_unknown_functions;
+ result = 0;
+
+done:
+ __libc_lock_unlock (__libc_utmp_lock);
+ return result;
+}
+weak_alias (__utmpname, utmpname)